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Add a getifaddrs(3) debugging tool. 

...disguised as a test, because that's the easiest way to keep an eye on it.

Change-Id: Iec2531183790d12aec561d27645e5d400f69efbf
This commit is contained in:
Elliott Hughes 2016-01-11 21:30:07 -08:00
parent 6b5139856d
commit 5d84373c69
1 changed files with 63 additions and 0 deletions
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63
tests/ifaddrs_test.cpp
View File

@ -19,6 +19,9 @@
#include <ifaddrs.h>
#include <linux/if_packet.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netdb.h>
#include <netinet/in.h>
TEST(ifaddrs, freeifaddrs_null) {
@ -61,3 +64,63 @@ TEST(ifaddrs, getifaddrs_smoke) {
freeifaddrs(addrs);
}
static void print_sockaddr_ll(const char* what, const sockaddr* p) {
const sockaddr_ll* s = reinterpret_cast<const sockaddr_ll*>(p);
printf("\t%s\t", what);
for (int i = 0; i < s->sll_halen; ++i) {
if (i > 0) printf(":");
printf("%02X", s->sll_addr[i]);
}
printf(" (%d bytes)\n", s->sll_halen);
}
static void print_sockaddr_inet(const char* what, const sockaddr* addr) {
char host[NI_MAXHOST];
int family = addr->sa_family;
int error = getnameinfo(addr,
(family == AF_INET) ? sizeof(sockaddr_in) : sizeof(sockaddr_in6),
host, NI_MAXHOST, nullptr, 0, NI_NUMERICHOST);
if (error != 0) {
printf("%d getnameinfo() failed: %s\n", family, gai_strerror(error));
strcpy(host, "???");
}
printf("\t%s: <%s>\n", what, host);
}
static const char* family_to_name(int family) {
if (family == AF_INET) return "AF_INET";
if (family == AF_INET6) return "AF_INET6";
if (family == AF_PACKET) return "AF_PACKET";
if (family == AF_UNSPEC) return "AF_UNSPEC";
return "?";
}
// Not really a test, but a useful debugging tool.
TEST(ifaddrs, dump) {
ifaddrs* addrs;
ASSERT_EQ(0, getifaddrs(&addrs));
for (ifaddrs* ifa = addrs; ifa != nullptr; ifa = ifa->ifa_next) {
int family = ifa->ifa_addr ? ifa->ifa_addr->sa_family :
ifa->ifa_broadaddr ? ifa->ifa_broadaddr->sa_family : AF_UNSPEC;
printf("%s\n\t%s (%d) flags=%#x\n",
ifa->ifa_name, family_to_name(family), family, ifa->ifa_flags);
if (family == AF_PACKET) {
if (ifa->ifa_addr) print_sockaddr_ll("hwaddr", ifa->ifa_addr);
if (ifa->ifa_broadaddr) print_sockaddr_ll("hwbroad", ifa->ifa_addr);
} else if (family == AF_INET || family == AF_INET6) {
if (ifa->ifa_addr) print_sockaddr_inet("address", ifa->ifa_addr);
if (ifa->ifa_broadaddr && (ifa->ifa_flags & (IFF_BROADCAST | IFF_POINTOPOINT)) != 0) {
print_sockaddr_inet((ifa->ifa_flags & IFF_BROADCAST) ? "broadcast" : "destination",
ifa->ifa_broadaddr);
}
}
fflush(stdout);
}
freeifaddrs(addrs);
}